Spark plug



Patented Apr. 21, 1925.

UNITED STATES PATENT OFFICE.

GIUSEIEPE NATOLI, OF YORK, N. Y.

SPARK PLUG.

Application filed March 1, 1924. Serial No. 696,287.

T all w/iom it may concern: lain and is provided with the central elec-Be it known that l, Grosnrrn Naroni, a trode 6 which is preferably castinto the subject of the King of ltaly, residing at lower end of thereceptacle. The core is New York, N. Y, have invented certain new soprovided with a shoulder 8 which exand useful Improvements in SparkPlugs. s around the core and thus forms a of which the following is a s)eciiication. means of securing it into the shell. Packing Thisinvention relates to an improvement ring 11 placed between the shoulder8 and in spark plugs and has for its object to proi c ill 1 prevents thegases from escaping vide a construction which can be easily confrom thecylinder of the engine and the 10 structcd and taken apart and can bemade ore 5 is secured in place by means of a 60 of a minimum number ofparts. A further securing nut 11. This nut 11 is threaded in object ofthis invention is to provide a long shell 1 and bears down on shoulder 8beand comparatively large receptacle around tween which a packing ring12 is provided. the central electrode for the purgose of coolit veryessential that the space 9 in the if) ing it, this receptacle beingadapted to be receptacle he of considerable length and of C5 tilled withoil which acts as a. medium for sutlicie t breadth so that the electrode(3 will transferring the heat from the electrode. A have large areavertically for radiating still further object is to pr vice a means heattherefrom to the oil contained in space for allowing the escape of thevolatiliaed oil 9. and that the oil or other suitable liquid butpreventing the liquid itselt from rundirectly contacts with theelectrode. 7 ning out or the receptacle and this means The shell isclosed at the top by means of comprises a valve situated in the closureof a closure 13 through which the central electhe cylindricalreceptacle. A small hole is trode projects and in which is provided aprovided in the grounded electrodes forprevent 14; having a valve 15therein. This venting the accumulation of oil to thus prevalve isretained on its seat by means of a 7. vent the carbonization of thesparking small spring 16 one end of which is secured points and itsimmediate surrouiulings. to the closure 13 and the free end of whichFurther objects will be apparent from the presses on the valve. Thus theplug may be following specification taken in connection turned orsecured in an 7 position since the with the accompanying drawing inwhich: oil contained in space 9 cannot flow out, yet 80 Figure l is alongitudinal se tional view it this oil should volatilize due toexcessive of the spark plug heating, the vapor can escape through theFig. :2 is side elevation thereof, and vent and cause no injury to theshell. A Fig. 3 is a plan view showing the elecsmall nut 17 ispreferably threaded on the trodes of the spark plug. electrode 6 tofasen the lead wire thereto in 35 Referring to the drawing the shell orthe usual manner. base member 1 is provided at its lower end This sparkplug can be easily taken apart with a screw-threaded section 2 into tiefor cleaning purposes by merely unscrewing lower end of which thegrounded electrodes the retaining nut 11 and lii'ting the core out 40 3are provided. These electrodes ma be of the shell. 9o

integral with section 2 as shown or may he I claim as my invention madeseparately and then inserted and se- 1. fr spark plug comprising a.shell; a cured in any suitable A small hole co he in said shell havinga. long receptacle l is drilled through the electrode 3 1n orde I rtherein; a retaining nut for securing said that oil which may collect onthem may run core in said shell; an electrode secured in through thehole to thus prevent carhonizasaid core and extending vertically throughtion which might ultimately result in a said receptacle; a closure forsaid core hav short circuit. ihe core member ing vent therein; a valvefor said vent; mg a re in lo 1s ina' v l means in said receptacle forcooling said an sulating "all but i rode. said valve allowing the escapeof the cooling medium under excessive heating.

2. A spark plug comprising a shell; a core in said shell having a longreceptacle therein; a retaining nut for securing said core in saidshell; an electrode secured in said core and extending verticallythrough said receptacle; a closure for said receptacle having a venttherein; a valve in said vent;

and a cooling medium comprising oil in said receptacle adapted tosurround and inti- 0 mately contact with said electrode to cool it saidvalve allowing the escape ofgthe voiatil ized oil upon excessiveheating. V

In testimony whereof I aflix my signature GIUSEPPE NATOLI.

